Discussion
Assertion (A): Increasing the magnetic field improves both sensitivity and resolution in NMR.
Reason (R): A larger field widens the population difference between spin states and spreads chemical shifts further apart in hertz.
Select the correct answer from the options below.
Answer: D
Both parts are true and the second is the reason for the first. A bigger field widens the Zeeman gap, so the Boltzmann excess grows and the signal with it, and because chemical shift in hertz is proportional to field while coupling constants are not, crowded multiplets separate. That double benefit is why laboratories pay for higher field magnets despite the cost of the cryogens and the siting. The gain in sensitivity goes roughly as the field to the three halves power, and the gain in dispersion is simply linear.
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